v3.25.4
Document And Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Mar. 10, 2026
Cover [Abstract]    
Entity Central Index Key 0001947210  
Entity Registrant Name High Roller Technologies, Inc.  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus FY  
Document Fiscal Year Focus 2025  
Document Type 10-K  
Document Annual Report true  
Document Period End Date Dec. 31, 2025  
Document Transition Report false  
Entity File Number 001-42202  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 87-4159815  
Entity Address, Address Line One 400 South 4th Street, Suite 500-#390  
Entity Address, City or Town Las Vegas  
Entity Address, State or Province NV  
Entity Address, Postal Zip Code 89101  
City Area Code 702  
Local Phone Number 509-5244  
Title of 12(b) Security Common Stock, par value $0.001 per share  
Trading Symbol ROLR  
Security Exchange Name NYSE  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
ICFR Auditor Attestation Flag false  
Document Financial Statement Error Correction [Flag] false  
Entity Shell Company false  
Entity Public Float $ 8.0  
Entity Common Stock, Shares Outstanding   10,890,098
Auditor Name WithumSmith+Brown, PC  
Auditor Location Whippany, New Jersey  
Auditor Firm ID 100